Sound emitting device



July 5, 193 J. SWALLDW 1,366,231

SOUND EMITTING DEVICE Filed May 27, 1929 Patented July 5, 1932 JOSEPHSVJALLOW, OF BERVYN', ILLINOIS, ASSIG'NOR TO TEMPLE CORPORATION, OFCHICAGO, ILLINOIS, A CORPORATION OF DELAXVARE SOUND EMITTING DEVICEApplication filed May 27, 1929. Serial No. 366,433.

My invention relates to sound emitting devices, and particularly toreproducing units adapted to be employed in connection with loudspeakers, or the like.

The inventionhas among its other objects the production of devices ofthe kind described that are durable, eflicient and simple inconstruction.

A. particular object of the invention is to provide an improvedreproducing unit of the type in which an armature is employed.

A preferred form of the invention is embodied in a reproducing unitcomprising a diaphragm which is operatively connected to a movablearmature positioned within a winding, the winding being adapted to besubjected to telephonic currents. Improved means comprising a relativelyflexible and resilient strip of metal is provided for mounting thearmature.

Many other objects and advantages will appear as this descriptionprogresses, reference being had to the accompanying drawing, wherein:

Figure 1 is a rear elevation of a reproducing unit which embodies myinvention;

Fig. 2 is a section taken on line 22 of Fig. 1;

Fig. 3 is a detailed view of an armature and an armature-carrying memberwhich form parts of the improved unit shown in Figs. 1 and 2.

Fig. 4 is a section taken on line 4-4 of Fig. 3, and v V Fig. 5 is asection taken on line 5-5 of Fig. 3.

Referring to the drawing wherein I have shown a reproducing unit whichembodies a preferred form of the invention, reference characterdesignates a housing member provided with the usual neck 11, whereby thereproducing unit may be operatively connected to a loud speaker, or thelike. A ring 12 riveted to the housing member 10 clamps the marginaledge of a diaphragm 15 to the housing member 10. The central portion ofthe diaphragm 15 is connected to an armature 16 by a pin 17, thearmature 16' being positioned within an armature-carrying member 18 thatis preferably formed from non-magnetic material.

,As best shown in Figs... 3, 4t and 5, the armature carryingmembercomprises a back plate 20, side plates 21 which are formed inte ral withthe back plate and inwardly turned flanges 22 formed integral with theside plates 21. The armature 16 is positioned between the back plate 20and the flanges 22, and is secured to the flanges 22 by a strip 23 whichis preferably formed from relatively flexible or resilient material andextends transversely of the armature. As best shown'in Figs. 3 and 4,the strip 23 is preferably formed with a plurality of lugs 25 which aresoldered to the armature 16. The ends of the strip 23 are notched toreceive the flanges 22 and arepreferably soldered thereto, although anyother suitable means may be employed for securing the strip to theflangesflf it is so desired.

Disposed around the armature-carrying member 18 is a winding 25 whichmay be subjected to telephonic currents, or the like, from aradio-receiving set, or the equivalent. The winding 25 is disposedbetween pole pieces 27 and 28 provided upon a permanent magnet 30 whichis secured to the ring 12 by bolts 32.

The operation of the above described device is substantially as follows:The winding 25 is subjected to a telephonic current derived from anysuitable source, and this causes the armature 16 to vibrate, whichvibrations are transmitted to the diaphragm 15 and translated intosound.

A feature of my improved construction I have found that by employing astrip of ill) metal substantially as described above for securing thearmature to the armature-carrying member, the strip may be soldered tothe armature-carrying member and to the armature in such manner that itwill not work itself free.

While I have shown and described certain embodiments of my invention, itis to be understood that it is capable of many modifications. Changes,therefore, in the construction and arrangement may be made withoutdeparting frpm the spirit and scope of the invention as disclosed in theappended claims, in which it is my intention to claim all noveltyinherent in my invention as broadly as possible, in view of the priorart.

WVhat I regard as new, and desire to secure by Letters Patent, is:

A device of the kind described comprising a diaphragm, a winding, anarmaturecarrying member within said winding, said armature-carryingmember being formed from sheet metal and being provided with inturnedflanges, an armature disposed within said armature-carrying member, astrip of metal extending transversely of said carrying member and saidarmature and extending in a plane normal to said inturned flanges, theends of said strip of metal being soldered to said flanges and saidstrip of metal being provided with integral lugs 6X- tending at rightangles from it, said lugs being soldered to said armature, and meansoperatively connecting said armature with said diaphragm.

In witness whereof, I have hereunto set my hand and aflixed my seal,this 17th day of May, 1929.

JOSEPH SIVALLOWV.

